Laminated sheet processing method and laminated sheet processing device

Abstract

Provided is a laminated sheet processing method capable of easily separating a base material for forming many kinds of laminated sheets, such as pressure-sensitive adhesive tapes, release films, and antistatic films, and a functional layer such as a pressure-sensitive adhesive layer, a release layer, and an antistatic layer laminated on the base material, from each other, at low cost. Furthermore, a laminated sheet processing device used for such a laminated sheet processing method is provided. The laminated sheet processing method according to an embodiment of the present invention is a method for processing a laminated sheet including a base material layer and a functional layer, and includes a step (I) of applying a separation liquid to a surface of the functional layer.

1 . A laminated sheet processing method for processing a laminated sheet including a base material layer and a functional layer, the laminated sheet processing method comprising
 a step (I) of applying a separation liquid to a surface of the functional layer.   
     
     
         2 . The laminated sheet processing method according to  claim 1 , comprising a step (II) of covering a coated surface to which the separation liquid has been applied in the step (I), with a cover material. 
     
     
         3 . The laminated sheet processing method according to  claim 2 , wherein the cover material is a backside surface, on an opposite side, of the functional layer as viewed from the base material layer of the laminated sheet. 
     
     
         4 . The laminated sheet processing method according to  claim 2 , wherein the cover material is the functional layer. 
     
     
         5 . The laminated sheet processing method according to  claim 2 , comprising a step (III) of applying an aqueous liquid to the coated surface to which the separation liquid has been applied in the step (I), or impregnating the coated surface with an aqueous liquid. 
     
     
         6 . The laminated sheet processing method according to  claim 5 , comprising a step (IV) of separating a component derived from the functional layer, from the base material layer. 
     
     
         7 . The laminated sheet processing method according to  claim 1 , wherein
 the separation liquid contains a liquid having a Hansen solubility parameter value of 31 or less, and an alkaline compound, and   a concentration of the alkaline compound in the separation liquid is from 0.001 wt % to 10 wt %.   
     
     
         8 . The laminated sheet processing method according to  claim 1 , wherein the functional layer is formed of at least one kind selected from the group consisting of an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a release layer, and an antistatic layer. 
     
     
         9 . A laminated sheet processing device comprising:
 feeding means for feeding a laminated sheet including a base material layer and a functional layer;   transporting means for transporting the laminated sheet;   separation liquid application means for applying a separation liquid to a surface of the functional layer;   separation means for separating a component derived from the functional layer, from the base material layer; and   recovering means for recovering a layer that remains after the component derived from the functional layer is separated from the base material layer.   
     
     
         10 . The laminated sheet processing device according to  claim 9 , comprising aqueous liquid application means for applying an aqueous liquid to a coated surface to which the separation liquid has been applied. 
     
     
         11 . The laminated sheet processing device according to  claim 9 , comprising aging means.